<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
		  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
		  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
		  <el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>
		
		<!-- 卡片视图区域 -->
		<el-card>
			<!-- 警告区域 -->
			<el-alert show-icon title="注意:只允许为第三级分类设置相关参数!" type="warning" :closable="false"></el-alert>
			<!-- 选择商品分类区域 -->
			<el-row class="cat_opt">
				<el-col :span="3">
					<span>选择商品分类：</span>
				</el-col>
				<el-col :span="8">
					<!-- 选择商品分类的级联选择框 -->
					<el-cascader
							expand-trigger="hover"
					    v-model="selectedCateKeys"
					    :options="catelist"
					    :props="cateProps"
					    @change="handleChange"></el-cascader>
				</el-col>
			</el-row>
			
			<!-- tab页签区域 -->
			 <el-tabs v-model="activeName" @tab-click="handleTabClick">
				 <!-- 添加动态参数的面板 -->
			    <el-tab-pane label="动态参数" name="many">
						<!-- 添加参数的按钮 -->
						<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
						<!-- 动态参数的表格 -->
						<el-table :data="manyTableData" border stripe>
							<!-- 展开行 -->
							<el-table-column type="expand">
								<template slot-scope="scope">
									<!-- 循环渲染tag标签 -->
									<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleColse(i,scope.row)">{{item}}</el-tag>
									<!-- 输入的文本框 -->
									<el-input
									  class="input-new-tag"
									  v-if="scope.row.inputVisible"
									  v-model="scope.row.inputValue "
									  ref="saveTagInput"
									  size="small"
									  @keyup.enter.native="handleInputConfirm(scope.row)"
									  @blur="handleInputConfirm(scope.row)"
									>
									</el-input>
									<!-- 添加的按钮 -->
									<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
								</template>
							</el-table-column>
							<!-- 索引列 -->
							<el-table-column type="index"></el-table-column>
							<el-table-column label="参数名称" prop="attr_name"></el-table-column>
							<el-table-column label="操作">
								<template slot-scope="scope">
									<el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
									<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
								</template>
							</el-table-column>
						</el-table>
					</el-tab-pane>
					<!-- 添加静态参数的面板 -->
			    <el-tab-pane label="静态属性" name="only">
						<!-- 添加属性的按钮 -->
						<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
						<!-- 静态属性的表格 -->
						<el-table :data="onlyTableData" border stripe>
							<!-- 展开行 -->
							<el-table-column type="expand">
								<template slot-scope="scope">
									<!-- 循环渲染tag标签 -->
									<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleColse(i,scope.row)">{{item}}</el-tag>
									<!-- 输入的文本框 -->
									<el-input
									  class="input-new-tag"
									  v-if="scope.row.inputVisible"
									  v-model="scope.row.inputValue "
									  ref="saveTagInput"
									  size="small"
									  @keyup.enter.native="handleInputConfirm(scope.row)"
									  @blur="handleInputConfirm(scope.row)"
									>
									</el-input>
									<!-- 添加的按钮 -->
									<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
								</template>
							</el-table-column>
							<!-- 索引列 -->
							<el-table-column type="index"></el-table-column>
							<el-table-column label="属性名称" prop="attr_name"></el-table-column>
							<el-table-column label="操作">
								<template slot-scope="scope">
									<el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
									<el-button size="mini" type="danger" icon="el-icon-delete"@click="removeParams(scope.row.attr_id)">删除</el-button>
								</template>
							</el-table-column>
						</el-table>
					</el-tab-pane>
			  </el-tabs>
		</el-card>
		
		<!-- 添加参数对话框 -->
		<el-dialog
		  :title="'添加' + titleText"
		  :visible.sync="addDialogVisible"
		  width="50%"
			@close="addDialogClose">
		  <!-- 添加参数对话框 -->
			<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
			  <el-form-item :label="titleText" prop="attr_name">
			    <el-input v-model="addForm.attr_name"></el-input>
			  </el-form-item>
			</el-form>
		  <span slot="footer" class="dialog-footer">
		    <el-button @click="addDialogVisible = false">取 消</el-button>
		    <el-button type="primary" @click="addParams">确 定</el-button>
		  </span>
		</el-dialog>
		
		<!-- 修改参数的对话框 -->
		<el-dialog
		  :title="'修改' + titleText"
		  :visible.sync="editDialogVisible"
		  width="50%"
			@close="editDialogClose">
		  <!-- 添加参数对话框 -->
			<el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
			  <el-form-item :label="titleText" prop="attr_name">
			    <el-input v-model="editForm.attr_name"></el-input>
			  </el-form-item>
			</el-form>
		  <span slot="footer" class="dialog-footer">
		    <el-button @click="editDialogVisible = false">取 消</el-button>
		    <el-button type="primary" @click="editParams">确 定</el-button>
		  </span>
		</el-dialog>
	</div>
</template>

<script>
	export default {
		data() {
			return {
				// 商品分类列表
				catelist: [],
				// 级联选择器的配置对象
				cateProps: {
					value: 'cat_id',
					label: 'cat_name',
					children: 'children'
				},
				// 级联选择器双向绑定到的数组
				selectedCateKeys: [],
				// 被激活的页签的名称
				activeName: 'many',
				// 动态参数数据
				manyTableData: [],
				// 静态属性数据
				onlyTableData: [],
				// 控制添加对话框的显示与隐藏
				addDialogVisible: false,
				// 添加参数的表单数据对象
				addForm: {
					attr_name: ''
				},
				// 添加表单验证规则对象
				addFormRules:{
					attr_name:[
						{ required: true, message: '请输入参数名称', trigger: 'blur' }
					]
				},
				// 控制修改对话框的显示与隐藏
				editDialogVisible: false,
				// 修改的表单数据对象
				editForm: {},
				// 修改表单验证规则对象
				editFormRules:{
					attr_name:[
						{ required: true, message: '请输入参数名称', trigger: 'blur' }
					]
				},
			
			}
		},
		created() {
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const {data: res} = await this.$http.get('categories')
				
				if (res.meta.status !== 200) {
					return this.$message.error('获取商品分类失败！')
				}
				
				this.catelist = res.data
				
				console.log(this.catelist);
			},
			// 级联选择器选中后发生变化，会触发这个函数
			handleChange() {
				console.log(this.selectedCateKeys);
				this.getParamsDate()
			},
			// tab页签的点击事件处理函数
			handleTabClick() {
				console.log(this.activeName);
				this.getParamsDate()
			},
			// 获得参数的列表数据
			async getParamsDate() {
				// 证明选中的不是三级分类
				if (this.selectedCateKeys.length !== 3) {
					this.selectedCateKeys = []
					this.manyTableData = []
					this.onlyTableData = []
					return
				}
				
				//证明选中的是三级分类
				console.log(this.selectedCateKeys);
				// 根据所选分类的id，和当前所处的面板，获得相对应的参数
				const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,{params: { sel: this.activeName }})
					
					if (res.meta.status !== 200) {
					        return this.$message.error('获取参数列表失败！')
					      }
					
					console.log(res.data);
					res.data.forEach(item => {
						item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [],
						// 控制文本框的显示与隐藏
						item.inputVisible = false
						// 文本框中输入的值
						item.inputValue = ''
					})
					
					if (this.activeName === 'many') {
						this.manyTableData = res.data
					} else {
						this.onlyTableData = res.data
					}
				 
			},
			// 监听添加对话框的关闭事件
			addDialogClose() {
				this.$refs.addFormRef.resetFields()
			},
			// 点击按钮，添加参数
			addParams() {
				this.$refs.addFormRef.validate(async valid => {
					if (!valid) return
					const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
						attr_name: this.addForm.attr_name,
						attr_sel: this.activeName
					})
					
					if (res.meta.status !== 201) {
					        return this.$message.error('添加参数失败！')
					      }
								
					this.$message.success('添加参数成功')
					this.addDialogVisible = false
					this.getParamsDate()
				})
			},
			// 点击按钮，展示修改的对话框
			async showEditDialog(attr_id) {
				// 查询当前参数的信息
				const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {params: { attr_sel: this.activeName}})
				
				if (res.meta.status !== 200) {
				        return this.$message.error('获取参数信息失败！')
				      }
							
				this.editForm = res.data
				this.editDialogVisible = true
			},
			// 重置修改的表单
			editDialogClose() {
				this.$refs.editFormRef.resetFields()
			},
			// 点击按钮，修改参数信息
			editParams() {
				this.$refs.editFormRef.validate(async valid => {
					if (!valid) return
					const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{ attr_name: this.editForm.attr_name, attr_sel: this.activeName})
					
					if (res.meta.status !== 200) {
					        return this.$message.error('修改参数失败！')
					      }
					
					this.$message.success('修改参数成功')
					this.editDialogVisible = false
					this.getParamsDate()
				})
			},
			// 根据ID删除对应的参数项
			async removeParams(attr_id) {
				const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
				          confirmButtonText: '确定',
				          cancelButtonText: '取消',
				          type: 'warning'
				        }).catch(err => err)
								
					// 用户取消了删除操作
					if (confirmResult !== 'confirm') {
						return this.$message.info('已取消删除')
					}
					
					// 删除的业务逻辑
					const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
					
					if (res.meta.status !== 200) {
					  return this.$message.error('删除参数失败！')
					}
					
					this.$message.success('删除参数成功')
					this.getParamsDate()
			},
			// 文本框失去焦点或者按下enter键
			async handleInputConfirm(row) {
				if(row.inputValue.trim().length === 0){
					row.inputValue = ''
					row.inputVisible = false
					return
				}
				// 如果没有return， 则证明输入的内容，需要做后续处理
				row.attr_vals.push(row.inputValue.trim())
				row.inputValue = ''
				row.inputVisible = false
				
				// 需要发起请求 报错这次操作
				this.saveAttrVals(row)
				console.log('ok');
			},
			// 将对attr_vals的操作 保存到数据库
			async saveAttrVals(row) {
				const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
					attr_name: row.attr_name,
					attr_sel: row.attr_sel,
					attr_vals: row.attr_vals.join(' ')
				})
				
				if (res.meta.status !== 200) {
				        return this.$message.error('修改参数项失败！')
				      }
				
				this.$message.success('修改参数项成功')
			},
			// 点击按钮，展示文本输入框
			showInput(row) {
				row.inputVisible = true
				// 让文本框自动获得焦点
				// $nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
				 this.$nextTick(_ => {
				          this.$refs.saveTagInput.$refs.input.focus();
				        });
			},
			// 删除tag标签对应的参数和选项
			handleColse(i,row) {
				row.attr_vals.splice(i,1)
				this.saveAttrVals(row)
			}
		},
		computed: {
			// 如果按钮需要被禁用，则返回true，否则返回false
			isBtnDisabled() {
				if (this.selectedCateKeys.length !== 3) {
					return true
				}
				return false
			},
			// 当前选中的三级分类的ID
			cateId() {
				if (this.selectedCateKeys.length === 3) {
					return this.selectedCateKeys[2]
				}
				return null
			},
			// 动态计算标题的文本
			titleText() {
				if (this.activeName === 'many') {
					return '动态参数'
				}
				return '静态属性'
			}
		}
	}
</script>

<style lang="less" scoped>
	.cat_opt {
		margin: 15px 0;
	}
	
	.el-tag {
		margin: 10px;
	}
	
	.input-new-tag {
		width: 120px;
	}
</style>